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<title>Problem 1751. -- [Usaco2005 qua]Lake Counting -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>1751: [Usaco2005 qua]Lake Counting</h2><span class=green>Time Limit: </span>5 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>64 MB<br><span class=green>Submit: </span>82&nbsp;&nbsp;<span class=green>Solved: </span>63<br>[<a href='submitpage.php?id=1751'>Submit</a>][<a href='problemstatus.php?id=1751'>Status</a>][<a href='bbs.php?id=1751'>Discuss</a>]</center><h2>Description</h2><div class=content>
Due to recent rains, water has pooled in various places in Farmer
John's field, which is represented by a rectangle of N x M (1 <= N
<= 100; 1 <= M <= 100) squares. Each square contains either water
('W') or dry land ('.').  Farmer John would like to figure out how
many ponds have formed in his field.  A pond is a connected set of
squares with water in them, where a square is considered adjacent
to all eight of its neighbors.

Given a diagram of Farmer John's field, determine how many ponds he has.

</div><h2>Input</h2><div class=content>
* Line 1: Two space-separated integers: N and M

* Lines 2..N+1: M characters per line representing one row of Farmer
        John's field.  Each character is either 'W' or '.'.  The
        characters do not have spaces between them.

</div><h2>Output</h2><div class=content>
* Line 1: The number of ponds in Farmer John's field.

</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata><br />
10 12<br />
W........WW.<br />
.WWW.....WWW<br />
....WW...WW.<br />
.........WW.<br />
.........W..<br />
..W......W..<br />
.W.W.....WW.<br />
W.W.W.....W.<br />
.W.W......W.<br />
..W.......W.<br />
<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata><br />
3<br />
<br />
OUTPUT DETAILS:<br />
<br />
There are three ponds: one in the upper left, one in the lower left,<br />
and one along the right side.<br />
</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
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